257878726040 has 64 divisors (see below), whose sum is σ = 625166942400. Its totient is φ = 95169987072.

The previous prime is 257878726019. The next prime is 257878726057. The reversal of 257878726040 is 40627878752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 946781 + ... + 1188339.

It is an arithmetic number, because the mean of its divisors is an integer number (9768233475).

Almost surely, 2^257878726040 is an apocalyptic number.

257878726040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257878726040 is an abundant number, since it is smaller than the sum of its proper divisors (367288216360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257878726040 is a wasteful number, since it uses less digits than its factorization.

257878726040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243636 (or 243632 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 56.

The spelling of 257878726040 in words is "two hundred fifty-seven billion, eight hundred seventy-eight million, seven hundred twenty-six thousand, forty".